I've created a texture pack, which I first uploaded in 14w10a and which is using 8x8 textures.

Until 14w11b everything seemed to be alright, but as soon as 14w17a was released, the textures of redstone were facing the wrong way and double plants lost their color.

I fixed the problem with the redstone by rotating the texture, but even though 14w18b was already released, double plants have no biome color.
They appear as grey, as the texture in the resource pack.